sql SQLite不支持更新查询中的联接，这使得在基于多个选项卡中的信息进行更新时出现一些复杂性

Posted 2021-05-13

UPDATE cars
  SET

    /* We don't have row values introduced in version 3.15.0 (2016-10-14.) */
    model = (
      SELECT u.new_model
        FROM cars c natural join mod_bod_upd u
        WHERE cars.rowid = c.rowid),
    body = (
      SELECT u.new_body
        FROM cars c natural join mod_bod_upd u
        WHERE cars.rowid = c.rowid)

  /* Specify only rows that will have a value to set, otherwise model and body
     will be set to null. */
  WHERE cars.rowid IN (
    SELECT c.rowid
      FROM cars c natural join mod_bod_upd);